The one big difference is that can now add a cover photo to your profile page on Google Plus similar to Facebook. And if you have applied some clever hacks – like animated GIFs – to your existing profile pages, there’s no reason to worry as you still have an option to stick to the older layout which has five thumbnails in a row.

The recommended dimensions are:

Profile Picture – 250×250 pixels

Cover Photo – 940×180 pixels

Thumbnail Photos – 110×110 pixels

The following video has more details on how you can customize the profile page of your Google Plus account.